Furnace-grate



( N Model.)

S. E. BURKE.-

PURNAGE GRATB. N0. 360,849. Patented Apr. l2, 1887'. J 2- I I6 6 Z ar a. zsv Y mmm UNITED STATES PATENT OFFICE.

STEPHEN- E. BURKE, OF EDON, OHIO.

`l-'uarmoe-c3RATE.

SPECIFICATION forming part of Letters Patent No. 360,849, datei!- .A pril'12, 1887.

Application filed August 12, 1F86. ScrialNo.2l0,G94. (No model.)

.To all whom it 17mg/ concern.-

Be it known that I, STEPHEN E. BURKE, a citizen of the United States, residing at Edon, in the county of Williams and State of Ohio,

nhave invented certain new and useful Improvements in Boiler-Furnace Grates; and I do bars will not be seriously interfered with.

AAnother object is to form the gratebars close enough together to retain all coal and fuel of such size as will be of use, and at the same time by the movement of the bars, to permitthe ashes to 'pass through, and thus free o them from ashes.

box, with parts broken away, showing the vertical section on line x :v of Fig. 1.

application of my improved grate. Fig. 2 is a Fig. Sisl avertical section on line u y of Fig. 1. Fig. 4 is `a crosssection through one corner of the box, showing journal resting in side bar; Fig. 5, a side view, with parts broken and in section, showing one form of grate-har and manner of applying cross-bar.

In the drawings the letter A designates the.

walls of the tire-box, provided on opposite sides with inwardly-projecting pins B. The pins support side bars, D, formed on their under faces with notches` or recesses a, into which the pins fit, so that the side bars are held against longitudinal movement and the pins will support the grate, and the said pins may be formed with heads, to prevent the bars from accidentally moving off of them sidewise. The bars are further formed at each end with pendent arms or ears E, through which are made the openings F, the tops, of which are curvedfand :the bottoms V-shaped, preferably, while the face of the ears above the openings may be recessed on the are of a circle, as shown, soas to permit the free rotation of the shaking and jarring shafts, hereinafter described, without 1 their binding against the faces ofthe ears, also for convenience in putting grates' in furnaces. The side bars are also formed on their outer faces with shoulders G, which hold the bars from the side walls, so as to leave spaces bctween the two parts for thepassage of air and dropping of ashes, and at their ends are recessed, as shown at b, so that the flue-sheets may be turned and riveted to the box. tops of theside bars are formed near their ends with stops H, which hold cross-bars I in place. The object of these cross-bars is to prevent ashes and cinders from dropping at opposite ends of the gratebars next to the walls of the furnace.

The shafls for supporting and moving the grate-bars,which move independently of each other,are designatedfby the letter J, and are each formed with journals c, preferably of an inverted-Vsl1aped`form, which tit in the V- shaped bearings or openings of the side bars, and also with projections d, preferably wedgeshaped, and which tit into the notches formed in the grate-bars, and with knockers e, which strike against the bottom of the gratebars to jar the bars, and which are preferably formed with openings e' for the passage of ashes.

The parts so far described constitute the frame' and support for the grate-bars, and are easily applied to and taken from their place, are strong and durable, and if any one part becomes broken or worn out it can be readily replaced by another.

The grate-bars are designated by the letter K, andare formed with notches f and y at each end in their under faces. The notches have inclined faces or sides, and those in the rear end are substantially of the form shown-that is,thelnotchis formed with oppositely-inclined walls or sides-and the two sides or walls separated by a plane surface or shoulder, h, which lies in a lower plane than the upper end of the inside wallyi, as shown, thus forming practically a double notch. The effect of this is that when the gratebars sag in the middle the pro The IOO.

jection d, which fits in the notch and supports l the grate-bars, passes from the inner wall or notch to the outer one,so that it will continue to act as before the bar sagged, and thus the sagging is compensated for. lf found desirable, both ends of the bar might be formed as the rear end has been'described, and the change not be a departure from my invention.

The projections of both shafts enter the notches f and g of the grate-bars and support the bars, but only one knocker at a time is in contact with the bars,so that when the front shaft is oscillated by means of a lever, L, temporarily inserted through an opening in the furnace and engaged in any suitable way with the shaft J, the gratebars are moved back and forth and struck by the knocker, first at one end and then at the other, alternately, so as to be raised and lowered and jarred.

rlhe front and rear shafts or knockers are preferably, though not necessarily, connected by a rod, M, so that the movement of one knocker downwardly will throw up the other knocker.

In a portable furnace I prefer to have the spacesj between the grate-bars begin at a distance of about one-fourth of theA length of the bars from the rear end of the grate, so that cold air will not pass up between them into the furnace-fines.

The grate-bars may have one or both ends beveled, as shown at 7c, Fig. 5, so as to move under what ashes may collect at the ends of the grate. rIhis form is particularly well adapted to stationary furnaces, although it may be used in the portable furnaces; and instead of having the bars I across the top ofthe grate-bars, they may lie beneath the bars, as shown in Fig. 5, in which event they may be supported upon any suitable projection on the side walls of the fire-box. XVhen they so lie under the grate bars, they do not so soon burn out.

In large furnaces, a bar similar to the bar D may be introduced between the two side bars, so as to permit the grate to be made in sections. In such event the central bar would have notches, as in the side bars, for the jonrnals ofthe k11ocker-sl1afts,and would be heavier than the side bars, because it would have to' support one side of both sections of the grate.

If desired, the rearplatc, I, maybe extended forward to about one-fourth of the length of the fire-box. In such event the oscillating bar J would be moved forward and the grate or grate-bars would continue from about such point to the forward part of the boX.

Having thus described my invention and set forth its merits, what I claim is l. The grate-bars formed with the double notch, in combination with the oscillating shaft having a projection fitting in said notch, substantially as described.

2. rlhe combination of the grate-bars formed with a V-shaped notch at one end and a double notch at the other, the oscillating shafts having projections fitting in said notches and provided with knockers to strike and jar the bars, snbstantiall y as and for the purposes specified.

3. rIhe combination of the fire-box, the side bars formed with journal-bearings, the oscillating shafts journaled in said bearings and formed with grate-bar-supporting projections and knoekers, independentlymoving gratebars formed with notches, in which said projections fit, and removable bars I at the ends of the grate supported transversely to the grate-bars, substantially as and for the purposes specified.

4. The combination ofthe fire-box, the grate composed of a series of grate-bars formed with a notch at one end and a double notch at the opposite end, shafts formed with projections fittingin said notches andprovidedwith knockers, and a rod connecting said shafts, substantially as and for the purposes set forth.

5. The combination, with a fire-box, of a grate composed of aserics of gratebars formed with double notches at their ends to receive oscillating projections and having the upper edge beveled, substantially as and for the purposes set forth.

6. The combination, with a fireboX, of a grate composed of a series ofgrate-bars having beveled or inclined ends 7c, and notches in the ends, at least one of which shall be a double notch, oscillating shafts having upward projections entering said notches, and a cross-bar, I, located, as shown, adjacent to said gratebars, substantially as described.

In testimony whereof Iaffix my signature in presence of two wit-nesses.

STEPHEN E. BURKE.

Vitnesses:

C. A. Bownnsox, HORACE GIN'rER.

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